Centennial

A centennial is a 100th anniversary or otherwise relates to a century, a period of 100 years.

Notable centennial events at a national or world-level include:

Centennial Exhibition, 1876, Philadelphia, Pennsylvania. First official World's Fair in the United States, celebrating the 100th anniversary of the signing of the Declaration of Independence in Philadelphia. About 10 million visitors attended, equivalent to about 20% of the population of the United States at the time. The exhibition ran from May 10, 1876, to November 10, 1876. (It included a monorail.)